The cc of the injector in the maximum it can flow. If you flow more fuel you have to flow more air, and the mixture has to be almost perfect. The lift on you engine is not effected by the amount of maximum flow of you injectors. When they say lift they are talking about how far the Valves lift Off their seats. If you want to find out more about how lift works on your engine look up VVTL_i engine and you will see a explanation and some diagrams.
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